Ill speak on behalf of myself and Pirana ... the parts that are chromed were removed from the car and taken to a professional chrome plating shop where they are cleaned (possibly sand blasted) and then given a chemical bath to remove ALL contaminants, plated in nickel, plated in chrome, then polished up a bit.
You can clean the parts yourself and work your way thru sand papers and polishes to get a somewhat shiny surface, but nothing will be either a professional polish job, or even better, the chrome plating.
Pe@ce